#include<stdio.h>
int main()
{
	int guanqia=1;
	while(guanqia!=0)
	{
		printf("-----metu-----\n");
		printf("-----buy-----1\n");
		printf("-----sell-----2\n");
		printf("-----out-----3\n");
		printf("-----show-----0\n");
		scanf("%d",&guanqia);
		switch(guanqia)
		{
			case 1:
				printf("you are selling to connsumer\n");
				break;
			case 2:
				printf("your are buy something to store\n");
				break;
			case 3:
				printf("checking the store\n");
				break;
			case 0:
				printf("the program is out \n");
				break;
			default:
				printf("you put a wrong guanqia\n");
				break;
		}
	}
	return 0;
 } 
